Open AccessOne-Step Hydrothermal Synthesis of W-Doped VO2 (M) Nanorods with a Tunable Phase-Transition Temperature for Infrared Smart Windows
Author(s) -
Liang Shan,
Qiwu Shi,
Huabing Zhu,
Bo Peng,
Wanxia Huang
Publication year - 2016
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.6b00221
Subject(s) - nanorod , materials science , hydrothermal circulation , hydrothermal synthesis , doping , nanotechnology , infrared , phase (matter) , phase transition , nanoparticle , chemical engineering , optoelectronics , optics , chemistry , organic chemistry , physics , quantum mechanics , engineering
Vanadium dioxide (VO 2 ), with reversible metal-semiconductor transition near room temperature, is a compelling candidate for thermochromic windows. Nanocomposite coatings derived from VO 2 nanoparticles are particularly superior to VO 2 films due to their advantages in large-scale preparation, flexible shaping, and regulation of optical properties. In this work, we developed a novel method for one-step hydrothermal synthesis of W-doped VO 2 (M) nanorods and studied their application in large-scale infrared smart windows. On introducing tartaric acid as a new reductant, VO 2 underwent a two-stage phase evolution from the pure phase comprising VO 2 (A) nanobelts to VO 2 (M) nanorods, instead of the conventional three-stage B-A-M phase evolution during hydrothermal synthesis. This transition is very favorable for the large-scale hydrothermal synthesis of VO 2 (M). The phase-transition temperature of VO 2 (M) nanoparticles can be regulated systematically by W doping, with a reduction efficiency of about 24.52 °C/atom % W. Moreover, VO 2 (M) composite films were fabricated using a convenient roller coating method, which exhibited significant midinfrared transmission switching up to 31%, with a phase-transition temperature of about 37.3 °C. This work demonstrates the significant progress in the one-step hydrothermal synthesis of VO 2 (M) nanorods and provides significant insights into their applications in infrared smart windows.